We're off to Mexico in two days (panic! panic! panic!) and I'm finding myself wondering about the unsafe water thing.
What's in the water? Bacteria? Viruses? Amoebae? What are they living on, in the water? Is this a fecal matter thing? Or what?
Are the same viruses/bacteria/amoebae in, say, raw fruit and veg there? Or does the plant's immune system protect it?